Anisokinetic Shrouded Nozzle System for Constant Low-Flow Rate Aerosol Sampling from Turbulent Duct Flow

Sippola, Mark R.; Nazaroff, William W.

doi:10.1080/02786826.2013.861892

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Aspiration ratio or aspiration efficiency was calculated to quantify the bias in the aerosol concentration entering the inlet of probe in shrouded air samplers. In other words, AR is defined as the ratio of aerosol concentration drawn (by suction) from the airstream in the wind tunnel into the inside of probe to the bulk aerosol concentration of the air stream (Sippola and Nazaroff 2014). Table 2 shows the performance of two (A and B) shrouded probes in combination with appropriate isokinetic air samplers at 5, 10, 15 and 20 m/s in terms of aspiration ratios.…”

Section: Aspiration Ratio (Ar)mentioning

confidence: 99%

“…Ram, Cain, and Taulbee (1995) and Cain, Ram, and Woodward (1998) tested the shrouded air sampler for the high velocity airborne aerosols in the size of 0.1-15 mm in the wind tunnel and verified the fluid dynamics design by calculating the airflow and the aspiration efficiency of the shrouded probes. Later Sippola and Nazaroff (2014) changed the cylindrical shape of probe (in shrouded air samplers) to an isokinetic design. They compared this new design with a buttonhook isokinetic nozzle at a constant low flow rate (2.2-8.8 m/s) and reported that the probe with an isokinetic shrouded nozzle had higher particle transmission than the other nozzles for sampling particles in a wind tunnel.…”

Section: Introductionmentioning

confidence: 99%

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Performance of two shrouded probes for the collection of liquid aerosols in a wind tunnel optimized for high air speeds

Fearing

Kalbasi

Zuniga

et al. 2020

Aerosol Science and Technology

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A combination of type A (high flow model) or B (low flow model) shrouded probe and appropriate isokinetic air-sampler (IAS) was tested in a wind tunnel that was optimized for high air speed testing using computational flow modeling. Liquid uranine aerosols (LUA) with AED (aerodynamic equivalent diameter) of 10 lm were generated at a constant flow rate using a vibrating orifice aerosol generator. The monodispersed aerosols were introduced into a wind tunnel at speeds of 5, 10, 15 and 20 m/s. The high flow (A) or low flow (B) model shrouded probe and the appropriate isokinetic air-sampler (IAS) was co-located to collect the LUA simultaneously during each treatment. After the test, the LUA deposited on the filters and inside the walls of the two air-samplers were collected and analyzed for fluorescence intensity units to determine the wall loss, transmission and aspiration ratios. While the type B shrouded probe had 20% (at 10 m/s) and 14.3% (at 15 m/s) higher wall loss ratios than model A, it had 16.1% (at 10 m/s) and 11.6% (at 15 m/s) higher transmission ratios compared to model A. Similarly, probe B had 17.6% (at 10 m/s) and 14.6% (at 15 m/s) higher aspiration ratios than probe A at similar air velocities. Overall, the wall loss, transmission and aspiration ratios of 10 mm AED ULA measured with two types of shrouded probes at 5, 10, 15 and 20 m/s air velocities in the optimized wind tunnel had good agreement with the range of standard data.

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Section: Aspiration Ratio (Ar)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of two shrouded probes for the collection of liquid aerosols in a wind tunnel optimized for high air speeds

Fearing

Kalbasi

Zuniga

et al. 2020

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

Development of a Sampling Probe for Representative Sampling of PM at Freestream Velocities in the Range from 0 to 300 km h−1

Heo

Lim

Lee

et al. 2018

Journal of Atmospheric and Oceanic Technology

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To accurately forecast the concentrations of fine and thoracic coarse particles [particulate matter (PM) 2.5 and 10, respectively], it is important to secure a large number of boundary conditions. For this purpose, particle concentrations need to be measured not only at predefined observatory sites but also in more regions. Various types of vehicles can be used for collecting ambient aerosol not only on the ground but also in the air, and thus it is necessary to use specially designed sampling probes that enable efficient sampling of particles in variable airstream velocity conditions. This study developed a double-shrouded probe as a representative sampling probe available within a range of stream velocity from 0 to 300 km h−1. An additional shroud was added to the outer face of a single-shrouded probe, and an annular tapered wing was added to a sampling tube. Numerical analyses and experiments were performed, and their results were compared. The double-shrouded probe was found to be appropriate for representative sampling of PM2.5 and PM10 at velocities of 300 km h−1 or less and 150 km h−1 or less, respectively, which are significantly extended compared to the range of the currently possible velocity for the single-shrouded probe. The double-shrouded probe onboard various types of air or land vehicles is expected to contribute to accurate measurements of PM concentration under the condition of a high-speed stream.

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Anisokinetic Shrouded Nozzle System for Constant Low-Flow Rate Aerosol Sampling from Turbulent Duct Flow

Cited by 2 publications

References 11 publications

Performance of two shrouded probes for the collection of liquid aerosols in a wind tunnel optimized for high air speeds

Performance of two shrouded probes for the collection of liquid aerosols in a wind tunnel optimized for high air speeds

Development of a Sampling Probe for Representative Sampling of PM at Freestream Velocities in the Range from 0 to 300 km h−1

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